Ninjas, the black-clad assassins known for secrecy and stealth, have now become a national myth in Japan.

They were originally trained as undercover agents in the Samurai era. Although they don't exist as spies anymore, their legacy lives on.

Ninja-themed restaurants and parks are popping up across Japan as authorities look to further boost a soaring tourism industry ahead of the 2020 Olympic Games in Tokyo.

The increase in the number of tourists has also created a big demand for people wanting to see 'Ninja shows', Saizo Tsunoda, a veteran Ninja performer, says.

But catching a glimpse of the legendary warriors may not be that easy.

TRT World's Mayu Yoshida reports from Tokyo, Japan.